Identical pitch-line velocity transmission means for apparatus for forming beads on cylindrical can bodies

ABSTRACT

A NON-SLIP, SCRATCH PROOF MEDIUM FOR BOTH THE INNER AND OUTER SURFACES OF CYLINDRICAL CAN BODIES AS THEY ARE ROLLED BETWEEN AN INTERNAL BEADING DIE AND A BEAD FORMING RAIL OF A BEAD FORMING APPARATUS ENTAILING DISPOSING THE CAN BODY AT ITS POINT OF TANGENT CONTACT WITH THE INTERNAL DIE AND BEADING RAIL AS CLOSE AS POSSIBLE TO THE PITCH LINE OF THE MAIN DRIVE MECHANISM AND ENABLING TRANSMISSION OF IDENTICAL PITCH-LINE VELOCITY TO THE INTERNAL DIE DESPITE ITS RADIAL SHIFTING DUE TO THE THICKNESS OF THE CAN BODY MATERIAL.

Sept. 21; 1971 D. VANDERLAAN IDENTICAL PITCH-LINE VELOCITY TRANSMISSIONMEANS FOR APPARATUS 7 FOR FORMING BEADS 0N CYLINDRICAL CAN BODIES FiledNov. 24, 1969 3 Sheets-Shut 1 INVENTOR.

.. vmm \\\\\\\\\\R Dir/r Vahdor/aan .7 .sp 71" ANDERLA IDENTICAbPITCH'LINE VELOCITY TRANSMISSION MEANS FOR APPARATUS FOR FORMING am s ONCYLINDRICAL CAN sonms Filed Nov. 24, was

3 Sheets-Shoot 8 INVENTOR. Dirk Vander/aan his affarney United StatesPatent O IDENTICAL PITCH-LINE VELOCITY TRANSMIS- SION MEANS FORAPPARATUE; FOR FORMING BEADS N CYLINDRICAL QAN BODIES Dirk Vanderlaan,Alameda, Califl, assignor to Borden, Inc., New York, N.Y. Filed Nov. 24,1969, Ser. No. 879,197 Int. Cl. B21d 15/06, 19/00 US. Cl. 72-94 9 ClaimsABSTRACT OF THE DISCLOSURE BACKGROUND This invention relates toapparatus for forming beads on cylindrical can bodies and moreparticularly to means for obtaining identical pitch-line velocityagainst a can body disposed between the forming die and bead formingrail of such apparatus.

Apparatus for beading metal cylinders is not basically new. One form ofsuch apparatus is shown and described in US. Pat. No. 2,407,776 whichissued to Gladfelter Sept. 17, 1946. Another form is shown in US. Pat.No. 3,089,533 dated May 14, 1963 to Stuchberry et al. Yet another formis well described in my co-pending U.S. application Ser. No. 662,000which I filed jointly with 00- inventors on Aug. 21, 1967 and from whichUS. Pat. NO. 3,490,404 issued Ian. 20, 1970.

Each of these prior disclosures has in common the broad basic concept offorming beads or annular creases in the side walls of can bodies whilepressing the same between an internal roller die and a fixed beadingrail. The fixed beading rail is usually of an arcuate curvature similarto a large rack gear from which a pinion gear connected to the internaldie receives rotary action while being turned about the rack gear. Thecan body is usually caused to roll about a portion of the fixed curvedbeading rail in unison with the rotation of the internal roller die asit travels about the rail.

It should here be noted that can bodies have their inner walls coatedwith a lacquer or enamel to prevent corrosion from acids in food matterlater to be preserved in the cans. While the internal beading die maynormally have non-slip contact with the coated inner surface of such canbodies any radial shifting of the internal dies and their pinion gearscauses a variance in rotary speed resulting in some slippage. Moreover,slippage between the exterior wall of such can body and the beading railhas heretofore been ignored. However, with the advent of the imprintingof decorative matter on the exterior walls of can bodies the necessityof avoiding scratching of both the outer as well as the inner surface ofsuch cylindrical can bodies becomes a problem. The decorative matter onthe exterior surface of such can bodies is usually graphic art,photographically reproduced in color and printed on the metal while in aflat condition. This printed matter may be a commercial label or apleasing pattern which is protected by a coating of varnish, lacquer andthe like and therefore subject to scratching if mishandled.Consequently, both inner and outer surfaces of such can bodies must behandled gently and subjected to the least 3,606,781 Patented Sept. 21,1971 amount of slippage in order to avoid scratching thereof during thebead forming operation.

STATEMENT OF THE INVENTION The present invention contemplatesalleviating the foregoing problem by achieving identical pitch-linevelocity between the internal die and a can body and substantiallyidentical pitch-line velocity between such can body and the bead formingrail while the bead creases are being formed in the can body. Heretoforeit was assumed that the pitch line of the driving gears had to beidentical to a pitch line extended therefrom through the center of thebeads projecting from the forming rail. The results of such error invelocity thus caused was not comprehended and therefore not taken intoconsideration. However, I have discovered that this differential invelocity is caused by the erroneous placement of the beading rail suchthat the bead centers at pitch-line. It is therefore an object of thepresent invention to place the pitch-line as close as possible to theperipheral surface of the beading rail from which the beads project.Since it is the peripheral surface of.the beading rail against which thecan bodies are pressed and rolled, the placement of such periphery asclose as possible to pitch-line of the driving gears results in aminimum of slippage and assures non-scratching and prevents marring ofthe coated exteriors of the can bodies.

In this connection it is an object of the present invention to providemeans for transmitting pitch-line velocity from the pinion gears to theperiphery of the internal beading dies while the latter turn about thebead forming rails disposed on a circumference substantially comparableto the pitch line of the teeth of the rack gear empowering the beadingdies.

Another object is to provide means for transmitting such pitch-linevelocity to the internal dies despite their offset relation topitch-line when initially engaging a can body about to be pressedagainst the beads on the beading rail.

It is yet another object to provide means for elfecting substantiallyidentical pitch-line velocity to the beading dies and rail relative toboth the inner and the outer surfaces of a can body regardless of thevelocity variance at the extremities of the beads on thebeading rail orradial shifting of the internal beading dies.

These and other objects of the present invention will become moreapparent from a reading of the following description and claims in thelight of the three sheets of accompanying drawing in which:

FIG. 1 is a section through a bead forming apparatus along the rotaryaxis thereof and taken substantially along line l-1 in FIG. 2;

FIG. 2 is a transverse section through FIG. 1 and taken substantiallyalong line 2-2 therein;

FIG. 3 is an enlarged detail of a portion of FIG. 1;

FIG. 4 is an enlarged detail of the opposite end of the portion of FIG.1 shown in FIG. 3;

FIG. 5 is a section through FIG. 3 taken along line 5-5 therein;

FIG. 6 is an elevational view partially in section of one die carriageand drive means therefor of FIG. 1;

FIG. 7 is a view similar to that of FIG. 6 with parts thereof in adifferent position;

FIG. 8 is a section through FIG. 6 taken substantially along line 88therein;

FIG. 9 is an enlarged section through the rack and pinion gear drivetaken along line 9-9 of FIG. 6;

FIG. 10 is an enlarged section through a portion of the can track andbeading rail of the apparatus as seen in FIG. 1;

FIG. 11 is a section complementary to that of FIG. 10 with a can bodydisposed in the can track thereof;

FIG. 12 is a section through FIG. 11 taken along line 12-12 therein; and

FIG. 13 is a diagrammatic illustration of the pitch-line velocityfeature of the present invention.

GENERAL DESCRIPTION In the drawings of the present application the beadforming apparatus 20 shown is comparable to the structure described andclaimed in my aforementioned application and US. Pat. No. 3,490,404. Itshould be understood, however, that the present invention is equallyapplicable to other apparatus of similar character such as the beadformers of the prior patents mentioned above or employing drive means ofthe general nature involved in this art.

In general the bead forming apparatus 20 shown in FIGS. 1 and 2 includesan annular can path 21 and means (not shown) for feeding cylindrical canbodies into such path at one zone and for discharging the can bodiestherefrom at another zone. The annular path 21 is formed between sidewalls 24-25 adapted to be adjustably spaced to accommodate can bodies ofvarious lengths and for guilding the can bodies in succession along afixed bead, forming rail 26. The side walls 24 and 2-5 are provided witha plurality of bead forming stations 27 in spaced relation segmentallyalong the annular can path 21. Means 31 are provided for maintaining thecan bodies in each of their respective bead forming stations as theytravel around the heading rail 26 within the annular can path 21. Theinner side Wall 24 has openings therein for admitting bead forming dierollers 28 into and out of the annular path 21 and the can bodies ateach bead forming station 27.

The bead forming die rollers 28 are arranged on a guide and supportingunit 29 for reciprocation laterally into and out of the respective beadforming stations 27. The bead forming die rollers 28 are driven by arack and pinion mechanism 43-44 for rotating the bead forming dies 28 inunison with the can bodies as they roll about the bead forming rail 26concurrently with the side walls 24-25 of the can path 21.

The guide and supporting units 29 for each bead forming die roller 28include a slide carriage 30 mounted for reciprocation parallel to theaxis of rotation of the side walls 24-25 and are disposed outside acylindrical housing 32 within which a fixed cam track 33 is confined. Acam follower roller 34 on each slide carriage 30 extends into the fixedcam track 33 to cause reciprocation of the carriage 30 and the beadforming roller die 28 thereon as the latter travel around the housing 32and can path 21, respectively. The cam track 33 is coordinated with abead forming portion 26' of the bead forming rail 26 such that when thecan bodies approach the portion '26 the beading dies 28 enter therespective can bodies and as the latter leave the bead forming portion26' the roller dies 28 are withdrawn from the can bodies freeing themfor discharge from the can path 21.

Within each head forming station 27 a pair of spring loaded lever arms35-35', one on each side wall 24 and 25, are disposed for engagement byouter bearing rings 36-36 on each of the bead forming dies 28'. Theselever arms 35-35 are disposed to yieldably urge the internal roller dies28 toward the bead forming portion 26 of the forming rail 26 forpressing the can bodies firmly against the beads on the portion 26'.However, the arms 35-35 are limited against such pressure to the extentthat no pressure is applied to the internal dies 28 during passagethrough zones other than that adjacent the bead forming portion 26'.Thus sufficient clearance is provided between the internal bead formingdies or rollers 28 and the beading rail 26 during reciprocation of therollers 28 into and out of. the can track and the can bodies therein.

It should here be noted that the bead forming portion 26 of the fixedbeading rail 26 involves a slight increment 37 radially of thenon-beaded portion of the rail 26. This raised section 37 of the beadforming portion 26' includes a number of half beads 38 spaced from oneanother transversely of the can path 21. The bead forming rollers 28consist of a plurality of ring-like dies 39 with smaller diameter dies40 interposed between them to provide annular grooves 41 which registerwith the half beads 38- on the bead forming portion 26' of the beadingrail 26. By this arrangement as the can bodies roll onto the beadforming portion 26' they are elevated due to the increment 37, againstthe ring-like dies of the bead forming rollers 28. Although the rollerdies 28 yield slightly due to the spring pressure from the lever arms36-36, they firmly press the can bodies against the beaded portion 26'of the rail 26. The can bodies may roll several revolutions duringpassage over the raised bead forming portion 26' of the rail 26 tothereby impress creases or beads inwardly of the cylindrical can bodiesin the course of such travel.

DETAILED DESCRIPTION OF THE PRESENT INVENTION Having thus described thegeneral arrangement of a .bead forming apparatus 20 the presentinvention has its embodiment in certain novel improvements by which toachieve a non-slip, scratch proof treatment to both the inner and outercoated surfaces of the can bodies. This feature has its embodiment inthe relationship between the rack and pinion drive mechanism 43-44 andthe raised bead forming portion 26 of the beading rail 26 as Well as theinternal beading dies 28.

Referring to FIG. 1 the apparatus 20 includes a stationary frame 45having fixed bearings 46-47 at opposite ends of a drive shaft 48. Thefixed bearing 46 at one end (left end, FIG. 1) of the apparatus has aninternal flange 49 upon which the cam track 33 is stationarily mounted.A series of webs 50 extend laterally from the flange 49 and terminate inthe spokes 51 of the fixed gear rack 43. The fixed gear rack 43 and thefixed cam track 33 are enclosed in the housing 32 which has at one end amaln boss 52 secured to the drive shaft 48 midway between the inner endsof the fixed bearings 46-47. The other end of the housing 32 is providedwith a roller bearing seal 53 disposed on an annular raceway 54 formedon the fixed bearing 46 for rotation co-axially thereof.

The side walls 24 and 25 are supported on and moveable with a tubularextension 55 of the housing 32. The head forming rail 26 is supported onrollers 56 spaced segmentally around the tubular extension 55 and theside Walls 24-25. The beading rail 26 is fixed against movement bysuitable brackets (not shown) which extend from the stationary frame 45into the can path 21 in the non-beading zone thereof, i.e. between thecan body infeed and discharge zones thereof.

The slide carriages 30 of each guide and supporting units 29 of each ofthe bead forming die 28 are mounted for reciprocable movement on a pairof rods 57 and 58. These rods 57 and 58 have their ends secured to therotary housing 32 between the inner side wall 24 of the can path 21 andbrackets 59 extending radially from the housing 32. The slide carriages30 include a cam follower and tool holder. The cam follower is mountedon a holder 60 for sliding movement upon the innermost one of the rods57 closest to the housing 32. The cam follower, holder 60 is mounted onthe other rod 58. The cam follower holder 60 has a cam follower head 61which extends into a guide slot 62 formed in the side wall of thehousing 32 for guidance parallel to the axis of rotation thereof. Thecam fol lower roller 34 is mounted on the inner end of the head 61 andextends into the cam track 33 as previously mentioned. The cam followerholder 60 is connected to a tool holder 60. To accomplish this theopposite end of the cam follower holder 60 (FIG. 1) is provided with anannular groove 63 formed therein to receive a two piece clamp end 64 ofa link 65. The opposite end 66 of the link extends into a slot 67 formedin a slide boss 68 of a tool holder 69. The end 66 of link 65 and boss68 have aligned bores which slidingly fit upon the outermost one of theguide rods 58 (FIG. 2) to thereby cause the tool holder 69 toreciprocate with the cam follower holder 60.

The tool holder 69 has a bearing boss 70 thereon disposed substantiallyaxially of and opposite a respective bead forming station 27 on the canpath 21. Each bearing boss 70 supports a spindle shaft 71 for one of thebead forming die rollers 28 for movement into and out of the can path21. The opposite end of the tool holding shaft 71 is connected by auniversal joint 72 to one end of a sleeve member 73.

The opposite end of each sleeve member 73 has a splined bushing 74secured therein to receive a splined shaft 75 facilitating telescopicmovement of the bushing and sleeve member 73 relative thereto. Theopposite end of the splined shaft 75 is connected by a universal joint76 to a stud shaft 77 suitably journaled in ball bearings 78-78 in anextension of the housing 32 embracing the perimeter of the fixed rackgear 43 therein. The pinion gears 44 for each roller die 28 is mountedon and secured to the respective stud shafts 77 for rotation therewithas influenced by the stationary rack gear 43 as the housing 32 rotateswith the shaft 48. The shaft 48 is driven by suitable drive means via anouter gear (lefthand FIG. 1).

By the foregoing arrangement each of the internal bead forming dies 28is supported for reciprocation into and out of the can path 21 in timedrelation with the movement of the cam follower rollers 33 relative tothe fixed cam track 34. As best seen in FIG. 8 the cam follower head 61is confined within a cap-like closure 79 secured to the housing 32 overthe guide slot 62 to keep an oil bath Within the housing 32 confinedtherein. The cam follower holder 60 mounted on the rod 57, althoughmovable inwardly and outwardly of the cap-like closure 79, is adequatelysealed by an oil seal ring 80 at the open end of the closure 79. Whenthe beading dies 28 are retracted from the can path 21 a roller 81 onthe tool holder 69 engages a guide track 82 on the housing 32 (FIG. 1).However, when the dies 28 are in can engaging position within the canpath 21, the rollers 81 are free of the guide tracks 82 such that theinternal dies 28 may be deflected in a radial direction, as by theincrement 37 in the beading rail 26.

In accordance with the present invention the pinion gears 44 are allmaintained in a relatively fixed relation to the fixed rack gear 43.That is to say, the axis of each stud shaft 77 is at all timesmaintained at a precise radial distance from the annular rack gear 43 sothat the pitch diameter of the latter and that of the pinion gears 44arealways tangently disposed. This assures that the pinion gears willalways turn at pitch-line velocity. Accordingly, it will be noted thatthe beading roller dies 28 will rotate at the same speed as therespective pinion gears 44. The ring-like dies 39 of the beading rollers28 have outer peripheries coinciding with the pitch diameter of thepinion gears 44. Consequently, the can engaging peripheries of thebeading dies 28 turn at pitch-line velocity regardless of the thicknessof the can bodies or seam joints therein. This is important because ofthe yieldability of the beading dies 28 due to the thickness of the canbodies and especially when engaging the four layers at the seams S ofthe can bodies (FIG. 12). Any movement of the pinion gears 44 radiallyoutward from pitch-line would normally change the speed of rotation ofthe pinion gears and complementarily, the speed of rotation of thebeading dies 28. Such change in speed causes scratching of the canbodies as previously explained.

With the universal joints 72 and 76 interposed between the yieldablebead forming dies 28 and their respective pinion gears 44 no such changein pitch-line velocity can occur. It will thus be appreciated that theinternal dies 28 rotated at identical pitch-line velocity throughout thebead forming operation regardless of radial shifting of the dies.

' As to the heading rail 26, the bead forming portion 26' thereof hasits peripheral can body engaging surface E disposed as close as possibleto the pitch-line PL extended from the larger fixed rack gear 43. Thisas illustrated in FIG. 13 is desirably the pitch-line diameter minus thethickness of the metal of the can body. It will be noteddiagrammatically in FIG. 13 that the ratio of the larger diameteredbeading rail 26 to the circumferential speed of the can bodies thereoveris related to a 15 inch radius as compared with a 1.125-inch radius ofthe bead forming dies 28. Consequently, much less slippage will occurbetween the bead forming portion 26' of the rail 26 and the outersurface of the can bodies than would occur if the slippage were betweenthe periphery of the dies 28 and the inner surface of the can bodies. Asexemplified in FIG. 13 a normal can body is .006 inch thick whereas acan body of double rolled metal is .003 inch thick. This slightdifferential between pitch-line diameter on a 15-inch radius is soslight as to be comparable in relation to the circumferential path overwhich the can bodies roll.

By this arrangement it may be logically said that the periphery of thebeading rail is disposed in a circumferential plane comparable to thepitch-line diameter of the stationary rack gear 43 while the canengaging peripheries of the internal dies are identical to thepitch-line diameter of thepinion gears. Moreover, the slight erroreffected by the relatively minute thickness of the can body wall beingapplied to the circumference of the larger diametered beading rail is soinfinitesimal as to be substantially comparable to the pitch-linediameter of the larger rack gear resulting in minimal slippage betweenthe external surfaces of the can bodies and the beading rail.

By reason of the foregoing relationship of the can body engagingportions of the beading rail 26' and the internal dies 28 rotating atidentical pitch-line velocity, scratching and/or marring of the canbodies is minimized and practically eliminated.

While I have described in specific detail the foregoing manner ofachieving identical pitch-line velocity to the bead forming roller diesand substantial pitch-line velocity between the outer surfaces of thecan bodies and the can bearing surface of the beading rails, it will beappreciated that variations in detail may be effected without departingfrom the spirit or scope of my invention therein. What I claim as newand desire to protect by Letters Patent is:

1. In a bead forming apparatus in which can bodies are rollingly movedalong a can path and pressed against a arcuately curved beading rail byinternal beading dies mounted on a rotary member for movement parallelto such beading rail; means for transmitting identical pitchlinevelocity to said internal beading dies and can bodies as they rollinglymove along the beaded surface of said beading rail comprising:

(a) a stationary rack gear having the pitch-line of its teeth disposedin a circumferential plane substantially comparable to the can bodyengaging beaded surface of such arcuately curved beading rail;

(b) a pinion gear operatively connected to each of said internal beadingdies and having a pitch-line diameter identical to the can body engagingperiphery of said internal beading dies; and

(c) means mounted on said rotary member for maintaining the pitch-linediameter of said pinion gears in tangential relation relative to thepitch-line of the teeth of said stationary rack gear despite deflectionof said internal dies radially outward relative to said beading rail.

2. The apparatus in accordance with that of claim 1 including:

(a) means for journaling each of said pinion gears relative to saidrotary member at a precise radial distance from said rack gear; and

(b) a guide and supporting means connected to said rotary member forguiding and supporting each of said internal beading dies for radialmovement relative to said beading rail dependent upon their rollingengagement with can bodies as the latter are pressed thereby against thebeaded surface of said beading rail.

3. The apparatus in accordance with that of claim 2 in which said guideand supporting means comprises:

(a) a tool holder for each of said internal beading dies;

(b) means for supporting said tool holders for radial movement relativeto said rotary member and the beading rail; and

(c) a universally jointed drive shaft between each of said tool holdersand a respective pinion gear for turning the internal dies at pitch-linevelocity as they press said can bodies towards the beaded surface ofsaid beading rail.

4. The apparatus in accordance with that of claim 3 in which said meansfor supporting each of said tool holders comprises:

(a) a spindle shaft for each of said internal beading dies and connectedto said universal jointed drive shaft;

(b) a bearing boss for rotatably supporting said spindle shaft;

(c) a bushing parallel to and offset relative to said bearing boss;

(d) means for pivotally mounting said bushing on said rotary member forrotary movement concurrently with said internal beading dies; and

means mounted on said rotary member and in engagement with each of saidinternal beading dies for yieldingly urging the latter toward the beadedsurface of said beading rail.

5. The apparatus in accordance with that of claim 1 in which said lastnamed means comprises:

(a) a stud shaft for journaling each of said pinion gears on said rotarymember at a precise radial distance from said rack gear;

(b) a spindle shaft for each of said internal beading dies;

() a tool holder for rotatably supporting the spindle shaft of each ofsaid internal beading dies;

((1) means on said rotary member for supporting said tool holders, theirspindle shafts and the internal dies thereon for radial movement of saiddies relative to said beading rail; and

(e) a universally jointed drive shaft between said stud shaft of each ofsaid pinion gears and the spindle shaft of the respective internalbeading dies for turning the latter at pitch-line velocity irrespectiveof deflection of said dies during the beading operation.

6. The apparatus in accordance with that of claim 5 in which the meansfor supporting said tool holders have:

(a) a cam follower thereon;

(b) a fixed cam adjacent the rotary member engageable by said camfollowers for reciprocating the latter from and toward said beadingrail, and

(c) a splined, telescopic connection between the ends of saiduniversally jointed drive shaft facilitating reciprocation of said toolholders and internal beading dies relative to said beading rail.

7. The apparatus in accordance with that of claim 6 in which the meansfor supporting said tool holders radially relative to said beading railcomprises:

(a) a pair of rods fixedly mounted on said rotary member for rotationtherewith about said fixed cam in unison with said pinion gears, theirdrive shafts and said internal beading dies relative to said headingrail;

(b) a slide boss on said tool holder and offset parallel in relationtherefrom for sliding movement on one of said rods;

(c) a cam follower holder mounted for sliding movement on the other oneof said rods and having said cam follower mounted thereon; and

(d) a linkage between said cam follower holder and said slide boss forrockably supporting said tool holder and the internal beading diethereon for radial movement relative to the can body engaging peripheralsurface of said beading rail.

8. The apparatus in accordance with that of claim 1 in which said lastnamed means comprises:

(a) a stud shaft for journaling each of said pinion gears on said rotarymember at a precise radial distance from said rack gear for maintainingthe pitchline of each of said pinion gears in tangent relation to thepitch-line of said stationary rack gear;

(b) a splined shaft;

(c) a universal joint connection between said stud shaft and one end ofsaid splined shaft;

((1) a splined sleeve mounted on the other end of said splined shaft fortelescopic movement axially thereof and rotation therewith;

(e) a tool holder for each of said internal beading dies pivotallymounted for rocking action on said rotary member;

(f) a universal joint connection between said splined sleeve and theinternal beading die on said tool holder;

(g) a cam follower connected to said tool holder; and

(h) a cam fixed adjacent the path of movement of said rotary member andengaged by cam follower for reciprocating said tool holders and theinternal dies thereon into and out of can bodies as they are movedrelatively parallel to said beading rail.

9. The apparatus in accordance with that of claim 8 including:

(a) a pair of rods fixedly mounted on said rotary member for rotationtherewith about said fixed cam;

(b) a slide boss formed integrally with said tool holder and in paralleloffset relation thereto and mounted for pivotal and sliding movement onone of said rods;

(c) a cam follower holder mounted for sliding movement on the other oneof said rods and having said cam follower mounted thereon; and

(d) a linkage between said cam follower holder and said slide boss forrockably supporting said tool holder and the internal beading diethereon for radial movement relative to the can body engaging peripheralsurface of said beading rail.

References Cited UNITED STATES PATENTS 3,210,979 10/1965 Laxo 72-943,490,404 1/1970 Vanderlaan et al. 113-115 LOWELL A. LARSON, PrimaryExaminer

